Crystal grinding machine



July 19, 1949. J. w. MOORE CRYSTAL GRINDINGMACHINE 3 Sheets-Sheet L Filed Ndv. 10, 1947,

3 Q Q. .3 I WR N mm w Q {E .3 1 Q Q ow July 19, 1949. J. w. MOORE 2,476,754

CRYSTAL GRINDING MACHINE Filed Nov. 10, 1947 s Sheets-Sheet 2' g) wanton Z H W Gum/114A; I

July 19, 1949. J.'w.'M'ooRE CRYSTAL GRINDING MACHINE 3 Sheets-Sheet 3 Filed Nov. 10, 1947 Patented July 19 1949 emsnse onvszrAn cemnme MACHINE ElohnW; Monte, Velasco; Tex; Anmicaiimelmmm 10, 1947, Serial No. 785,042

a grinding machine of the character described.

which is equipped with gau escsowmounted that the movement, of the grinding; jawed-relative. tc the crystal, will best ppedtwhe-n:the-crvstalhas beenlprecisely groundtorfitisaidzhezel.

While the grinder herein; described; has; been specially designed forv grinding watchy-eiflfifiels it is also adapted for general grinding; purposes where it may be desired to grind a disc toragpnedetermined transverse diameter;

Other objects and advantages; will beennarent from the following specification wh1eh ;.-is illustrated by, the accompanying.drawings;;whereine Figure 1 is a side view of the grindeizpartl-y in section, mounted,on.;ythe a la he ihed...

Figure zisiaplan view; t

Figure 3 is a cross-sectionalview-. takeneonabhe line 33 of Figure 1.. 7

Figure 4 is a cross-sectionalviem takeniontthe line 4-4 of Figure .1, and

Figure 5 is a cross-sectionalview taken-onethe.

line 5-5 of Figure 1.

Referring now more particularlytdthe drawings wherein like numerals.oireierenceldesignate similar parts in each of the figures, .thenumeraI i designates a sta'ndi'to whose. upperend awlathe bed 2' is'secured any preferred'mannelx,

Mounted on one end of thebed"? there. are. the upstanding-aligned bearings '3; II in which a shaft 5' is mounted to rotate and fixed on this shaft between said bearings there isa series "of" driving pulleys- B to-reoetve adrivingbe1t tlrrougkwhich the shaft 5 may be driven.

Adjustably' mounted onother "end of the bed 2. there is a tail stOck-I- haVing-an elongated bearing. 81 therethrough-to receive one-end" of the shaft v9 which isalig ned with the shaft The outer end. of-r theheating-e ls enlarged in diameter and .inasaidcenlanged end there is a rod- Hlwhose outer end carries. grip-H and whose inner end: issilormedzwriiih an: enlarged Between the head Iliandnthecoppos'ingendfief the shaft .9 thereis; aha-ll hearingylda Within the l enlarged: mention: "of thegiimarin there is acoilspringddwhidhasin'mnndsidihfirefi .5

.ID and which confinedf hetweenf'the head 12 at one, end and-the cap 1'5. at the ot ner end. This cap surrounds) the rod '"Land is screwed onto the corresponding: panto'f the tail stock I The spring 1.4 isnnnderacompression. so as to hold thehall bearing! 3 againstlthe adi fi t-e of-v .the shafiiB';

The numeral 1'6. designates a watch icrys'taL Jto heigrlound. It held clampedbetween-circular clampingjaws l il;, .'l,8', .thelformer of. which is fixed on. theiendr of; shaft, .5 and the) latter oil isfixed. on theend c'rilshaftla,v Theerystal this of? conventional, .cohdavmcdnvexshape (and the adjacent sides oiwtheria-ws I 1,, t8: should be-scorrespondingly shaped so as to fit; the crystal and to grip-it-firmly between said jaws.

Thehed #2 has a fiat-.uppersurface and mounted on .-.said:-suriace there ista channel shaped; sup.- portingj-rame having the horizontal-base li9:and the: upstanding side. vfiangest 211- H.

Depending fromfi this :frameaand having a detachable-connection therewith thereais a red 22 which; extends threughta suitable-wbeaning-l-in the lathe bed 2 and whose lower isi-threaded :te receive aclamp; nut'23. whereby said; Ira-me may be clamped fixed position .arelativer to; "the [beds Upstanding 'irom the. iendsaof the: rrame where are the. transverse end-flanges 242 anda-v25 -a-nd anchored: tothese flanges, one on each-side are the rods 26 and 25!,,-w=hich-=form tracks.

Located v-hetween the flanges :24 and: r2fiwthere is an upstanding; adj ustable, supporting :xplate- 28 having the; elongated- ;sleevee1ike:hearingse25;and 3flizsecured thereto which. arezmounted omitlre respective :correspending:csods 2 E; 2: 1: 'sol'fihat 'the, supportingsplatee zasmay: she mnved flongitudinally respectzto said/rods;

.Fastened withe -forward side: 10f the plate; 28 are the: vertical guides, 201' tracks; 53 .15, :32 which are spaced apart.

There: are: thexsimi'lar upper. and lower jaws 33; 34;.zpreiereibly. fnrmed -nf- 'rsuitable' :sheet metal andewhiclr; diverge iorwardly, as -shcwn in Figure 1r. They are:offldovietailedformation, as indicated :in Figured, -.and.':dov eta iled i ntc t'hese jawsarej theupper and; larvae abrasitze elements: 3'5; 85 formed of; zanytselected material suitable forthe purpose.

Therinneriendzoizthe jaw-3 Balsturne d upwardl-y and the inner end of the jaw 34- is turned down-- wardiy, asiind-icated; in dottew' lines in 'Figi-ire 1, and; these overturned ends fitflaetween the guides 31: andtfiis These grinding; or abrasive; elements are quantiallyenciosed hy a semi cyli-ndrical' hood- 3H sons/end: efwhich is suitably secured to "the upstanding plate 28 and whose forward end is free. This hood is provided with a transparent section 58 for inspection of the grinding operations.

Secured to the inner side of the hood 3'! there is a bracket 39. Fastened to this bracket there is an arcuate leaf spring 46 whose ends are inwardly curved and bear against the jaws 33, 34 and are located forwardly of the overturned ends of said jaws so as to retain the: jaws against detachment; from the guide in which they move.

Around the shaft 5 and extending through and rotatable in the plate 28 there is a short tubular shaft 4|. this shaft between the jaws 33, 34 there is a cam member 42. This memberhas the correspondingly pitched cam faces 43, 44.

Fixed to the other end of the tubular shaft 4| there is a handle 45; which is retained thereon by means of a nut. The handle 45 may be manipulated to turn the cam member 42 so that the cam faces 43, 44 will ride against the corresponding jaws 33, 34 to force them apart. On the rear side of the plate 28 there is an arcuate rack member 41 having spaced holes, or openings, 48 therein and pivotally mounted on the handle 45 there is a thumb lever 49. The lower end of this thumb lever 49 carries a dog 56 which may be engaged in either of the openings 48' and is retained in said engaged position by means of a flat spring 5| whose outer end is secured to the thumblever 49 and whose inner end bears against the handle 45, as shown in Figure 1, so as to hold said dog in engagement in any selected opening 48.

By pressure on the thumb lever 49 the dog 50 may be released and said handle adjusted to any desired position so as to spread the jaws 33. 34 the desired distance apart depending on the diameter of the crystal being ground. When thehandle 45 is released from the rack member 41 the spring 40 will force the jaws 33, 34 and the abrasive elements carried by said jaws inwardly toward each other.

T The upper margin of the flange 2| is outwardly turned forming a table 52 whose upper side is formed with a dovetailed groove wherein the gauge plate 53 is mounted to slide. As shown the outer margin of the table 'is formed witha longitudinal depending flange 54.

1 Secured in any preferred manner to the upper side of the plate 53 there are the spaced strips of metal 55, 55 whose inner margins are beveled to form a dovetailed groove, as more accurately shown in Figure 5, and fitted into this groove and slidable therein there is a gauge strip 56 whose outer, or forward, end carries a grip member 51 whereby the gauge strip 51 may be moved longitudinally with respect to the gauge plate 53. The forward end of the gauge plate 53 is upwardly curved, as indicated in Figure 1, and is centrally slotted, as indicated in Figure 2, to allow the adjustment of the gauge strip 56. This gauge strip 56 is provided with an upstanding stop 58 at its inner end which may be secured thereto in any preferred manner. Securedto the forward end of the flange 54 there is a bracket 59 whose upper end is inwardly turned and extends over the gauge plate 53 and is-spaced above it.

Threaded through the overturned end of the bracket 59 are the'clamp screws 60, 66 which may be screwed downwardly into clamping relation with the strips 55 ofsaid gauge plate to clamp the gauge plate against movement and Fixed on the forward end of also threaded through the overturned end of the bracket 55 there is a clamp screw 6| in alienment with the gauge strip 55 and whereby said SBl'lP may be clam ed against movement. when 5 said screws 60, 5| are released the gauge late 53 and the gauge strip 56 may be relatively adjusted, as desired, and when clamped by said screws held in said adjusted position.

Fixed to the forward end of the table 52 there is an internally threaded sleeve 52 through which the clamp screw 63 is threaded. This clamp screw may be screwed upwardly into clamping engagement with the gauge plate 53 to hold said plate against movement, or released, to permit the movement of the plate.

Secured to, and upstanding from, the gauge plate-'53 there is a longitudinal bearing 64 which is internally threaded and threaded through this hearing 64 there is the screw gauge 55. The forward end of this screw gauge is extended and has a grip member 66 fixed thereon by means of which it may be turned. Also upstanding from the gauge plate 53 but slidable relative thereto, there is a fork 67 whose upper end is provided with spaced bearings 68 and 69 in which the extended end of the screw gauge 65 is rotatable and on said extended end between said bearings there is a stop it! which prevents the longitudinal movement of the screw gauge 65, relative to the fork, 'as said screw gauge is turned. The fork 57 is provided with an outstanding stop "H which is arranged opposite the stop 58, said stops 58 and H forming gauge points.

Fastened to the forward end of the bearing 64 there is another fork 12 whose lower end is forwardly turned and bifurcated, its fingers embracing the fork 61 to prevent said fork from turning.-

Fastehedto the rear side of the plate 28 there is'a U-shaped stop 13 whose side arms are secured to said plate on opposite sides of the bearing 54 so that the stop 13 will be in alignment with the screw gauge 65.

In use the jaws 33, 34 should be adjusted to the proper distance apart depending on the diameter of the crystal IE to be ground and the supporting plate 28 should then be moved forwardly until the margin of the unground crystal contacts with the abrasive elements 35, 36. The gauge plate 53 should then be moved rearwardly until the gauge screw 65 contacts the stop 13 and the screws 60 or 63 tightened to lock the gauge plate 53 in fixed position, and the gauge strip 56 should then be precisely adjusted so that the unground crystal l6 will fit snugly between the gauge points 58, H and the screw M then tightened to maintain such adjustment. The supporting plate 28 may then be returned to its original or starting position. The gauge screw Gil-should then be turned until its rear end is in contact with the stop I3. The unground crystal may then be removed from between the gauge points 58, H and a milli.. meter gauge should then be used to measure the exact diameter of the crystal seat of the bezel of the watch to which the crystal is to be fitted and the gauge point II should then be adjusted, by turning the gauge screw 65, until the gauge points 58, 1|" are a distance apart equal to the diameter of the bezel seat, which is also the diameter of the crystal to be ground. 6

This adjustment will move the rear end of the screw. gauge'a distance from the stop 13 equal 7 to the difference between the diameter of the ungroundcrystalfand of the after itis ground.

The unground crystal [.6 may then be again clamped: between the jaws I]; and 1:8. and the supporting plate 28* again moved; forwardly by hand and the crystal will be ground as the plate moves. forwardly until the stop 13 contacts the opposing end of the gauge screw. 165 .at which time the grindingv operation will. be completed and: the crystal I16: willbe of the same diameter as the bezel seat to receive it.

The drawings and description are illustrative merely while the broad principle of the invention.

be defined by the appended claims.

What I claimis:

l. crystal. grinding machine comprising, a supporting base, a track thereon, an upstanding support mounted to move. on said track, opposed jaws adjustable relative to each other on the support, opposed abrasive surfaces on the jaws, aligned shafts arranged axially with respect to the abrasive surfaces, clamp means on the shafts for gripping the crystal to be ground between them, said support and abrasive surfaces being movable to bring said surfaces into and out of contact with-the crystal and means for rotating the shafts.

2. A crystal grinding machine comprising, a supporting base, a track thereon, an upstanding support mounted to move on said track, opposed jaws on the support radially adjustable toward and from each other, abrasive elements on the jaws, aligned shafts arranged axially with respect to said abrasive elements, clamping jaws on the adjacent ends of said shaft to clamp the crystal to be ground between them, said support being movable to bring the abrasive elements into and out of contact with the margin of the crystal, means for manually moving said jaws apart, yieldable means acting against the jaws and normally tending to move them toward each other.

3. A crystal grinding machine comprising, a supporting base, a track thereon, an upstanding support mounted to move on said track, opposed jaws on the support radially adjustable toward and from each other, abrasive elements on the jaws, aligned shafts arranged axially with respect to said abrasive elements, clamping jaws on the adjacent ends of said shafts to clamp the crystal to be ground between them, said support being movable to bring the abrasive elements into and out of contact with the margin of the crystal, means for manually moving said jaws apart, yieldable means acting against the jaws and normally tending to move them toward each other and means for maintaining the clamping jaws in yieldable contact with the crystal.

4. A crystal grinding machine comprising, a supporting base, a track thereon, an upstanding support mounted to move on said track, opposed forwardly diverging jaws adjustable relative to each other on the support, opposed abrasive surfaces on the jaws, aligned shafts arranged axially with respect to the abrasive surfaces, clamp means on the shafts for gripping the crystal to be ground between them, said support and abrasive surfaces being movable to bring said surfaces into and out of contact with the crystal and means for rotating the shafts.

5. A crystal grinding machine comprising, a supporting base, a track thereon, an upstanding support mounted to move on said track, opposed jaws on the support adjustable toward and from each other, abrasive elements on the jaws, aligned shafts, arranged; axially. with. respect-to said abrasive elements, clampin jaws: on the adjacent endsofsaid shafts-gto clamp. the crystal to, be ground between them, saidsupport'being movable to. bring the abrasive elements; into and. out of. contact withthe margin ofthecrystal, means for manually moving said jaws. apart, means for maintaining the jaws .at: a. selected point of adjustment, yieldable means acting. against the jaws and normally tending :to move them, toward each, other;

56. A crystal grinding. machine comprising, a. supporting base, a track thereongan upstanding support mountedi to move on said track, opposed forwardly diverging jaws on the support adjust, able toward: and. from each other; abrasive .elements on the jaws, aligned shafts; arranged axially with respect to said abrasive: elements, clamping jawsionthe adjacent ends 'of said shafts to clamp the crystalto beground between them, said support .beingmovable torbring the abrasive elementsintoand out. ofcontact with the margin of the crystahmeans for manually moving said jaws apart, yieldable means. acting against the jaws and normally tending-to movethem toward-each other andmeans-fon maintaining the clamping jaws in yieldable; contact, with the crystal.

7. A crystal grinding machine; comprisin a supporting base, a track thereon, anlupstanding support mounted to move on said track, a, guide on the support, opposed forwardly diverging jaws adjustable relative to each other along said guide, opposed abrasive elements on the jaws, aligned shafts arranged axially with respect to the abrasive elements, clamp means on the shafts for gripping the crystal to be ground between them,

said support and abrasive elements being movable to bring said elements into and out of contact with the crystal and means for rotating the shafts.

8. A crystal grinding machine comprising, a supporting base, a track thereon, an upstanding support mounted to move on said track, opposed jaws on the support adjustable toward and from each other, forwardly diverging abrasive elements on the jaws, aligned shafts arranged axially with respect to said abrasive elements, clamping jaws on the adjacent ends of said shafts to clamp the crystal to be ground between them, said support being movable to bring the abrasive elements into and out of contact with the margin of the crystal, means for manually moving said jaws apart, means for maintaining said opposed jaws at a selected point of adjustment, yieldable means acting against the opposed jaws and normally tending to move them toward each other.

9. A crystal grinding machine comprising, a supporting base, a track thereon, an upstanding support mounted to move on said track, a guide on the support, opposed forwardly diverging jaws on the support adjustable along the guide toward and from each other, abrasive elements on the jaws, aligned shafts associated with the abrasive elements, clamping jaws on the adjacent ends of said shafts to clamp the crystal to be ground between them, said support being movable to bring the abrasive elements into and out of contact with the margin of the crystal, means for manually moving said diverging jaws apart, yieldable means acting against the diverging jaws and normally tending to move them toward each other and means for maintaining the clamping jaws in yieldable contact with the crystal.

i 10. A grinding machine comprising, asupporting base, rotatable vclamp means yieldingly mounted above the base adapted to yieldingly grip the opposite sides of, androtate, a disc to be ground, an upstanding support mounted on the base to move axially with respect to the clamped disc, forwardly diverging grinding jaws on the support movable, with the support, into contact with the margin of the unground disc and means on the base and support, respectively, arranged to contact, upon further movement of the support, to stop such forward movement of the support and jaws and thereby limit the reduction in transverse diameter of the disc being ground. 1

- 11. A grinding machine comprising, a supporting base, rotatable clamp jaws mounted above the base and spaced apart so as to clamp between them, and rotate, a disc to be ground, an upstanding support mounted on the base to move axially with respect to the clamped disc, forwardly diverging grinding jaws on the support movable, with the support, into contact with the margin of the unground' disc and adjustable means on the base and support, respectively, arranged to contact, upon further forward movement of the support, to stop such 'forward movement of the support and jaws and thereby limit the reduction in transverse diameter of the disc being ground.

12. A grinding machine comprising; a support-i ing base, rotatable disc-like clamp jaws mounted above the base adapted to yieldingly clamp between them, and rotate, a disc to be ground, an upstandingsupport mounted on the base and manually movable axially with respect to the clamped disc, forwardly diverging grinding jaws on the support movable, with the support, into contact with the margin of the unground disc and adjustable means on the base and support, respectively, arranged to contact, upon further forward movementof the support, to stop such forward movement of the support and jaws and thereby limit the reduction in transverse diameter of the disc being ground.

' JOHN W. MOORE.

REFERENCES CITED The following references are of record in the file'of this patent;

, UNITED STATES PATENTS Number Name Date 790,705 Schrader May 23, 1905 1,044,254 Sargent Nov. 12, 1912 2,344,036 Franck Mar. 14, 1944 FOREIGN PATENTS Number Country Date 700,677 France Mar. 5, 1931 

